MAX1201 Datasheet, PDF (13/16 Pages) Maxim Integrated Products – +5v sINGLE-sUPPLY, 2.2mSPS, 14-bIT sELF-cALIBRATING adc

+5V Single-Supply, 2.2Msps, 14-Bit
Self-Calibrating ADC
The MAX1201 has three power-supply inputs: analog
V_DD (AV_DD), digital V_DD (DV_DD), and drive V_DD
(DRV_DD). Each AV_DD input should be decoupled with
parallel ceramic chip capacitors of values 0.1µF and
0.001µF, with these capacitors as close to the pin as
possible and with the shortest possible connection to
the ground plane. The DV_DD pins should also have
separate 0.1µF capacitors again adjacent to their
respective pins, as should the DRV_DD pin. Minimize the
digital load capacitance. However, if the total load
capacitance on each digital output exceeds 20pF, the
DRV_DD decoupling capacitor should be increased or,
preferably, digital buffers should be added.
The power-supply voltages should also be decoupled
with large tantalum or electrolytic capacitors at the
point the voltages enter the PCB. Ferrite beads with
additional decoupling capacitors forming a pi network
could also improve performance.
The analog power-supply input (AV_DD) for the
MAX1201 is typically +5V, while the digital supplies
can vary from +5V to +3V. Usually, DV_DD and DRV_DD
pins are connected to the same power supply. Note
that the DV_DD supply voltage must be greater than or
equal to the DRV_DD voltage. For example, a digital
+3.3V supply could be connected to DRV_DD while a
cleaner +5V supply is connected to DV_DD resulting in
slightly improved performance. Alternatively, the +3.3V
supply could be connected to both DRV_DD and DV_DD.
However, the +3.3V supply should not be connected to
DV_DD while the +5V supply is connected to DRV_DD
(Table 2).
Table 2. Power-Supply-Voltage
Combinations
AV_DD
(V)
5
5
5
5
DV_DD
(V)
5
5
3.3
3.3
DRV_DD
(V)
5
3.3
3.3
5
ALLOWED/
NOT ALLOWED
Allowed
Allowed
Allowed
Not
Allowed
Chip Information
TRANSISTOR COUNT: 56,577
SUBSTRATE CONNECTED TO AGND
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